Re: gEDA-user: Re: 4-bit_12-LED.png (PNG Image, 1024x768 pixels)
On 4/15/07, Levente [EMAIL PROTECTED] wrote: Svenn Are Bjerkem [EMAIL PROTECTED] wrote: [...] Microsoft Visio has a feature that make wire jumps automagically. You can even deside if the horisontal wires or the vertical wires should jump. Arc crossing makes readability of schematics subjectively better, just like that solder dot to explicite show connection even on T-connections. (If the dot happens automagically, then you know that there is a connection) So you want to travel back in the 50's or 60's in USA, where they used to use this on hand drawings... I recall a schematic of a tube amp showing this kind of jumpers... :-) No, I do not want to. I just explained something to somebody and added a personal opinion on the topic based on my own experience. Did you read the other emails in the thread? -- Kind regards, Svenn ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: photo-imagable supplies (was: dremel drill press)
DJ Delorie wrote: They seem to go where I want them. [jg]Great. I'll be trying some PCB carbide bits soon. The deviation of the bit itself is far less than the alignment accuracy of the two halves of the board. Off by 10 mil or so - this is my first try at double sided, I need to try a few techniques and see which is most accurate. I'm thinking of switching from toner transfer to photomask. Then, I can drill the board first and use the holes to line up the print. I've thought about that some, and also got a chance to do some film tests recently that were not acceptable -- it seems no easy photography supplier films are high enough contrast to get a good film for exposing photomask -- just dark grey instead of opaque black. Or black and grey if you expose it differently... So the supplies for making a pos from a neg or a reduction in size from a 2:1 print are hard to get. Agfa quit serving the US it seems -- I found one source that supplies super fine line chip/interconnect making film and didn't even bother to go through the hoops to get the price since they were dodging around the question so much. So, if you use toner on clear film and maybe stack two of them to get opacity, what's your source of photoimagable mask emulsions? I'd want some that are good with a red light instead of any total darkness processes. If you do photoimagable etch resist, you're all ready to go for soldermask also... and for masks to put on conductive inks too maybe... Conductive inks are now used in some lowest-cost-planet-wide circuit boards made in China so they have only one side etched, and the jumper layer is mostly ink on the same side, reducing holes to the minimum. You sometimes have to make conductive ink wide or use a copper wire jumper on the other side to get your desired conductance for a path, but leaving out drilling holes is best by me... John Griessen ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: home-made dremel drill press
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi I'm thinking of switching from toner transfer to photomask. Then, I can drill the board first and use the holes to line up the print. I've been using masks almost exclusively to make my boards. I don't think that drilling holes for components before exposure is a good idea. If you drill before applying the photoresist, you will get uneven thickness around the holes due to surface tension. On the other hand if you drill the board when the photoresist is already there you risk damaging it. At least the positiv 20 I'm using is very soft even when dried with hot air and you can easily scratch it (when etching double sided boards I stick little bumps on the board to protect its surface from the bottom of the container with acid) What I do is drill two pilot holes before applying the photoresist in the unusable border around the circuit and use them to align the masks before exposure. It's not perfect though and I have experimented a bit with some other techniques (for example aligning the top and bottom masks before slipping the coated board between them). Best regards Tomaz -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGI7shsAlAlRhL9q8RAvHLAJ4/26QK4R32SgmIpnOlFWixWAmLKACfSvkB QohEifmFD/4s9P2UJv3IRwo= =WhoF -END PGP SIGNATURE- ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Reminder: gEDA code sprint is next Saturday (in one week)!
Stuart Brorson wrote: If you wish to participate via IRC, you may find us on the #geda channel. Which server, Freenode.net? -- Darryl Gibson N2DIY RLU X 182668/379552 “Arms are the only true badges of liberty. The possession of arms is the distinction of a free man from a slave.” -- Andrew Fletcher, A Discourse of Government with relation to Militias (1698) ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: home-made dremel drill press
On Sun, 15 Apr 2007 12:36:32 -0400 DJ Delorie [EMAIL PROTECTED] wrote: http://www.delorie.com/pcb/dremel-stand/ Hi DJ. Is the site down? I can't seem to connect... John ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: home-made dremel drill press
John Coppens wrote: On Sun, 15 Apr 2007 12:36:32 -0400 DJ Delorie [EMAIL PROTECTED] wrote: http://www.delorie.com/pcb/dremel-stand/ Hi DJ. Is the site down? I can't seem to connect... I'm getting unable to connect errors too. -- Darryl Gibson N2DIY RLU X 182668/379552 “Arms are the only true badges of liberty. The possession of arms is the distinction of a free man from a slave.” -- Andrew Fletcher, A Discourse of Government with relation to Militias (1698) ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Reminder: gEDA code sprint is next Saturday (in one week)!
On Mon, 2007-04-16 at 15:33 -0400, Darryl Gibson wrote: Stuart Brorson wrote: If you wish to participate via IRC, you may find us on the #geda channel. Which server, Freenode.net? geda.seul.org -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Footprint Changes at luciani.org
I have changed the pin numbering on the footprints for the Hirose DF9 Series plugs. These should now be numbered in a similar manner to DSUBs and SCSI connectors. This should be only change to the footprint tarball since the last update (24-Feb-2007). --- When I made these footprints I could not find pin numbering in the Hirose datasheet so I numbered the plugs and sockets using the convention of the plug and socket on the Crossbow Mote (MICA). This was a mistake. The MICA board has a plug and socket with pin one in the upper left corner. Since the connectors are keyed you cannot get mated pin ones. If you are going to make boards that interface with Crossbow boards you may want to create footprints (and corresponding gschem symbols) with names like --- CON_HDR_XBOW_MICA51P plug that goes on a MICA CON_HDR_XBOW_MICA51S socket that goes on a MICA CON_HDR_XBOW_INT...51P plug that goes on an interface board CON_HDR_XBOW_INT...51S socket that goes on an interface board (* jcl *) -- http://www.luciani.org ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
